Originally Posted by
ala_xfire
If the CEL keeps coming on, and your reader shows no faults, then you need another ( better ) reader.
I highly doubt the light is on with no faults, but I may be wrong.
A more advanced OBDII scanner will pick up more detailed manufacturer specific error codes. Even then they don't pick them all up, and it may be necessary to take it to a dealer or independent that has a DRBIII scanner.